The current in the adjoining circuit will be

|
(a) |
(b) |
(c) |
(d) |
The current in the adjoining circuit will be

|
(a) |
(b) |
(c) |
(d) |
(c)
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A silver and a copper voltmeters are connected in parallel across a 6 volt battery of negligible resistance. In half an hour, 1 gm of copper and 2 gm of silver are deposited. The rate at which energy is supplied by the battery will approximately be (Given E.C.E. of copper = 3.294 and E.C.E. of silver = 1.118
|
(a) 64 W |
(b) 32 W |
(c) 96 W |
(d) 16 W |
A circular coil of diameter 7cm has 24 turns of wire carrying current of 0.75A. The magnetic moment of the coil is
|
(a) 6.9 |
(b) 2.3 |
|
(c) |
(d) |
If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to
|
(a) CV |
(b) |
(c) |
(d) |
The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be
|
(a) 4 |
(b) 4 |
(c) 4 |
(d) 4 |
The process of adding impurities to the pure semiconductor is called
|
(a) Drouping |
(b) Drooping |
(c) Doping |
(d) None of these |
The mechanism of the heat produced in a conductor when an electric current flows through it, can be explained on the basis of
|
(a) Viscosity |
(b) Friction |
(c) Free electron theory |
(d) Gauss's theorem |
In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be

|
(a) 1.944 r |
(b) 0.973 r |
(c) 0.486 r |
(d) 0.243 r |
All of the following statements are correct except
|
(a) The magnification produced by a convex mirror is always less than one |
|
(b) A virtual, erect, same-sized image can be obtained using a plane mirror |
|
(c) A virtual, erect, magnified image can be formed using a concave mirror |
|
(d) A real, inverted, same-sized image can be formed using a convex mirror |